thats totally fascinatingPlastic ziplock bags are great for eggtopsy of any egg, stinky or not.
Sometimes you'd be surprised at what you find. If you go to www.brinsea.com on the left-hand margin they have their incubation handbook for downloading. In it is a most-helpful index of eggtopsy results cause and effects. You'd be surprised at what humidity problems can do to your embryos!
Last hatch I had a bunch of last minute (Day 19/20) quitters. Turns out it was oxygen deprivation due to hatching sea-level eggs at a high altitude (pores are not conducive to thin mountain air). Had I not done an eggtopsy I would've wondered when they quit and not been able to figure it out... BYC provided the other clues as to what all happened. I also found one egg with a malformation (open brain) which had the cause and effect listed in the handbook. Hopefully never have to see that again!